Intellinet Network Solutions 523967 - Manual (Page 37)

2-3-5 Setup procedure for 'L2TP xDSL':
L2TP is another popular connection method for xDSL and other Internet
connection types, and all required setting items are the same as the PPTP
connection.
As with PPTP there are two kinds of settings. Fist come the 'WAN
Interface Settings':
Select how you obtain an IP address from your service provider here. You
can choose 'Obtain an IP address automatically' (equal to DHCP, refer to
'Cable Modem' section above) or 'Use the following IP address' (i.e. static
IP address).
The WAN interface settings must be correctly entered or the Internet
connection will fail even if the L2TP settings are correct. Contact your
ISP if you don't know how you should fill in these fields.